TWI566949B - Screen printing machine printing table lifting device - Google Patents

Description

Screen printing machine printing table lifting device

The invention relates to a lifting device for changing the height of a printing table of a screen printing machine, in particular to a lifting device which adopts an oblique relative movement design to improve the displacement accuracy of the printing platform.

In the general screen printing operation, it is necessary to adjust the height position of the printing platform of the screen printing machine. At present, the lifting device of the common printing platform mostly adopts a plurality of driving cylinders to drive the action stroke of ascending or descending, and rises. The speed of the descent is further controlled by a pneumatic valve mounted in connection with the cylinder.

However, the internal gas of the cylinder has compressible characteristics, which often affects the displacement accuracy of the ascending or descending action due to various factors such as the change of the pneumatic source by the pneumatic valve, the volume of the cylinder itself, the amount of water in the air, and the oil content. It is difficult to quickly adjust the movement of a plurality of cylinders to the same uniform state, which will cause a long working time for the printing platform to move to the set position.

In addition, the use of cylinders for lifting and lowering will cause the air around the screen printing machine to flow rapidly, which will easily cause the printing ink to rapidly evaporate and solidify, thereby increasing the cleaning frequency of the screen printing machine, and if the gas pressure inside the cylinder is insufficient, the printing platform Fear of supporting damage to equipment or casualties.

In view of the many lack of use of the cylinder drive, there is another screen printing machine on the market that uses a motor-driven chain to control the movement of the printing platform to rise or fall, but the screen-driven screen printing machine is prone to vibration and Problems such as large backlash error. Moreover, no matter whether the printing platform adopts the lifting mode formed by the cylinder or the chain, not only the screen printing machine mechanism is complicated, but also the volume cannot be reduced, and the tolerance of the displacement precision is too large to affect the printing quality of the whole workpiece.

The main object of the present invention is to form a lifting device for adjusting the height of the printing table by using an obliquely moving lifting member combined with a single driving source, so that the members can be stably moved in the oblique direction, thereby changing the height position of the printing platform, so that The accuracy of the displacement of the printing platform during the ascending or descending stroke is increased, and the number and size of the components of the lifting device can be greatly simplified, and the manufacturing cost of the screen printing machine can be reduced.

Another object of the present invention is that the lifting device can be used with a single, two or more sets of detecting devices to perform image comparison of the workpiece printing position, and transmit the obtained screen and workpiece images to the control system to reduce the manual adjustment time. And can be printed accurately to reduce the defect rate, thereby increasing the printing capacity of the screen printing machine.

In order to achieve the above object, the lifting device of the present invention is applied to a screen printing machine to adjust the height of the printing table, and the image position comparison of the workpiece printing by using at least one detecting device comprises a printing platform, a driving device and at least one lifting device. And at least one traction mechanism.

The driving device is located below the printing platform and is mounted on a fixing surface of the screen printing machine; the lifting mechanism is connected between the printing platform and the driving device, and is provided with a first moving member and a first moving member a second moving member that moves relative to the first moving member is connected to the printing platform, and the second moving member is connected to the driving device; and the traction mechanism is connected at one end to the printing platform, and the other end is connected to the fixing The surface is used to limit the longitudinal displacement of the printing platform to rise or fall.

When the driving device drives the displacement of the second moving member of the lifting mechanism, the first moving member of the lifting mechanism generates a one-position movement along an oblique direction, and simultaneously drives the printing platform to change the longitudinal height position.

In a preferred embodiment, the first moving member side forms a first horizontal plane connecting the printing platform, the other side forms a first inclined surface defining the oblique direction, and the second moving member side is formed. A second horizontal plane is connected to the driving device, and the other side forms a second inclined surface opposite to the first inclined surface.

Further, the traction mechanism is provided with a rod member extending in the longitudinal direction, and a sleeve which is mutually displaceable is movably attached to the outside of the rod member, and the rod member and the sleeve are respectively fixed on the bottom of the printing platform and the top of the fixing surface.

In addition, a plurality of guide rails and guides forming the guiding mechanism may be further disposed between the first inclined surface of the first moving member and the second inclined surface of the second moving member, and the length direction of the guiding rail is parallel to the above The guide is movably assembled to the guide rail and is reciprocally displaced along the tilt direction by the action of the guide rail.

In addition, the driving device of the present invention is provided with a power component mounted on the fixing surface, and the power component is connected to a transmission mechanism for lateral movement, and the transmission mechanism is further connected to the second moving component to enable the power component to be driven. The second moving member moves synchronously. Further, at least one sliding mechanism is further disposed between the transmission mechanism and the fixing surface for reducing the force applied to drive the displacement of the transmission mechanism.

In a possible embodiment, the power component is a servo motor; the transmission mechanism is provided with a screw connected to the power component, and the screw is screwed to a nut that can reciprocate along the extending direction of the screw, and then The nut is connected to a connecting seat, so that the connecting seat can be displaced by the power component; and the sliding mechanism comprises a sliding rail mounted on the fixing surface and at least one sliding seat connected to the transmission mechanism.

As can be seen from the foregoing description, the present invention drives the second moving member of the lifting mechanism to perform horizontal lateral movement through the driving device. When the second moving member moves closer to the first moving member, the first moving member is pushed against the tilting direction. The direction is obliquely moved upward; when the second moving member moves away from the first moving member, the first moving member will move obliquely downward along the oblique direction, thereby forming a gapless displacement manner to change the printing platform. The height of the table top.

The invention adopts the servo motor to accurately drive the moving distance in the oblique direction, so that the displacement accuracy of the table height of the printing platform is increased or decreased, and the first moving part and the second moving part of the oblique relative displacement design are also The number and size of components of the lifting device can be greatly simplified, and the manufacturing cost of the screen printing machine can be effectively reduced.

Furthermore, when the printing platform is in the ascending stroke, the CCD detection and the screen printing operation can be performed, and when the printing platform is in the descending stroke, the contact friction between the workpiece and the printing platform during the drawing process can be avoided, thereby causing the workpiece to be scraped. The injury is damaged.

In order to further clarify and understand the structure, the use and the features of the present invention, the preferred embodiment is described in detail with reference to the following drawings:

First, referring to FIG. 1 and FIG. 2, the lifting device 3 of the present invention is mainly located under the workpiece 20 of the screen printing machine 2, and the lifting device 3 is respectively provided at two opposite ends of the length extending direction of the workpiece 20, and the workpiece 20 is respectively driven. The moving roller 21 and the lifting device 3 are respectively disposed on opposite sides of the longitudinal direction of the workpiece 20, and are respectively provided with a plurality of detecting devices 22, and the detecting device 22 is mainly for detecting the screen above the lifting device 3 (Fig. Not shown) and the image of the workpiece 20, and the target position can be designed with the print size. In a possible embodiment, the detecting device 22 is provided with a photosensitive coupled device 23 (CCD) to capture images.

Referring to FIG. 3 and FIG. 4, the lifting device 3 of the present invention is mainly mounted on a fixing surface 24 of the screen printing machine 2, and includes a printing platform 4 capable of displacement displacement, and four groups of lifting and lowering height distances. The mechanism 5, a driving device 6 as a power source and four sets of traction mechanisms 7 for restricting the moving direction, wherein the number of the lifting mechanism 5 and the traction mechanism 7 is only a preferred operation embodiment of the drawing, that is, a single group Lifting and towing can be achieved in less than four or more than four groups.

The printing platform 4 of the present invention is provided with a working plate 40 on the top forming a printing table. The bottom of the working plate 40 is provided with a connecting plate 41. The connecting plate 41 has a smaller area than the working plate 40, and the connecting plate 41 is provided with a plurality of sides. The wall plate 42 is perpendicular to the working plate 40 and is in contact with the outer side of the connecting plate 41, and a plurality of accommodating spaces 43 are integrally formed between the plurality of wall plates 42, and the plurality of lifting and lowering mechanisms 5, The driving device 6 and the plurality of traction mechanisms 7 are located inside the accommodating space 43.

As shown in FIG. 1 , FIG. 4 and FIG. 5 , the lifting mechanism 5 of the present invention is provided with a first moving member 50 and a second moving member 51 that can be displaced from the first moving member 50 , and the first moving member 50 . A first side 501 and a second side 502 inclined to the first side 501, the first side 501 of the first moving member 50 is a first horizontal surface 503, and the connecting plate fixed to the printing platform 4 is mounted. 41. The second side 502 of the first moving member 50 is defined as a first inclined surface 504 defining an oblique direction 52. In addition, the second moving member 51 also has a first side 511 and a second side 512 inclined to the first side 511. The first side 511 of the second moving member 51 is set as a second horizontal surface 513, and is mounted. The second side 512 of the second moving member 51 is fixed to the second inclined surface 514 which also defines the inclined direction 52.

When the lifting mechanism 5 is operated by the driving device 6, the second moving member 51 is horizontally moved laterally to change the vertical height position of the first moving member 50. When the second moving member 51 advances toward the first moving member 50 for forward movement, the first moving member 50 is pushed against and the second moving member 51 generates an oblique direction along the inclined direction 52. Relatively moving; when the second moving member 51 is retracted toward the first moving member 50 for reverse movement, the first moving member 50 will generate a gradient along the oblique direction with the second moving member 51 due to gravity. The diagonal movement of 52 is obliquely downward.

Thus, the interaction between the first moving member 50 and the second moving member 51 causes the lifting mechanism 5 to perform a relative movement of the tilting direction 52, thereby changing the height position of the printing platform 4.

In the preferred embodiment of the present invention, a guiding mechanism 53 is further disposed between the first inclined surface 504 of the first moving member 50 of the lifting mechanism 5 and the second inclined surface 514 of the second moving member 51, thereby ensuring the above. The stability of the lifting mechanism 5 during the ascending or descending stroke.

In a possible embodiment, the guiding mechanism 53 is configured as a set of mutually cooperating guide rails 531 and a guide 532. The length of the guide rails 531 extends parallel to the tilting direction 52 and is disposed on the second movement. The second inclined surface 514 of the member 51 has a guiding groove 533 at the center thereof, and is disposed on the first inclined surface 504 of the first moving member 50, and the length extending direction of the guiding groove 533 is also parallel to the oblique direction. 52, the guide 532 is movably assembled to the guide rail 531, and the guide 532 is restricted by the guide rail 531 to reciprocate forward or backward along the oblique direction 52. However, the above-mentioned guiding mechanism 53 adopts the guide rail 531 and the guide 532 as the structural aspects of the embodiment, and is not limited thereto for convenience of description.

Referring to FIG. 1, FIG. 4 and FIG. 6, the driving device 6 of the present invention is mounted between the fixing surface 24 of the screen printing machine 2 and the second moving member 51 of the lifting mechanism 5, and the driving device 6 is provided with a Mounted on the base 60 of the fixing surface 24, the base 60 is provided with a power component 61 and a laterally movable transmission mechanism 62. The transmission mechanism 62 is connected to the power component 61 on one side and The second moving member 51 is connected to the side of each lifting mechanism 5 such that the power element 61 can synchronously drive the second moving member 51 to move. In a possible embodiment, the power component 61 is configured as a servo motor capable of stably and accurately controlling the rotational speed of the rotating shaft.

As shown in the figure, the transmission mechanism 62 includes a screw 621, a nut 622, and a connecting base 623. The connecting base 623 is provided with a substrate 624 connected to the second moving member 51, and the bottom of the substrate 624 is disposed. a mounting bracket 625 is provided. One end of the screw 621 is connected to the power component 61, and the other end is connected to the mounting bracket 625. The nut 622 is screwed to the screw 621 and connected to the mounting bracket 625. When the power element 61 acts to rotate the screw 621, the nut 622 can reciprocate along the length extending direction of the screw 621, and synchronously drive the connecting seat 623 to generate a displacement operation.

In addition, in the preferred embodiment of the present invention, the driving device 6 of the present invention may further include two sliding mechanisms 63 for reducing the displacement force of the transmission mechanism 62, in addition to the power component 61 and the transmission mechanism 62. The two sliding mechanisms 63 are disposed between the fixing surface 24 and the connecting seat 623 of the transmission mechanism 62, and are respectively mounted on opposite sides of the power component 61 so that the moving direction of the sliding mechanism 63 is parallel to the transmission. The nut 622 of the mechanism 62 moves in the direction. The sliding mechanism 63 includes a sliding rail 631 attached to the fixing surface 24 and at least one sliding bracket 632 connected to the transmission mechanism 62. The sliding bracket 632 is provided with a sliding slot 633 corresponding to the sliding rail 631.

Referring to FIG. 4 and FIG. 7, the four sets of traction mechanisms 7 of the present invention are mainly installed at four corner positions between the connecting plate 41 of the printing platform 4 and the fixing surface 24, and the traction mechanism 7 is provided with a rod 70. And a sleeve 71 that is sleeved on the rod member 70, the rod member 70 is connected and fixed to the bottom of the connecting plate 41 of the printing platform 4, and the sleeve 71 is connected and fixed to the top of the fixing surface 24, and the rod member is The longitudinal opening restriction formed by the sleeve 71 allows the printing platform 4 to be individually lifted or lowered in the longitudinal direction without any lateral displacement in the horizontal direction.

Referring to FIG. 6 and FIG. 8 , when the power element 61 (servo motor) of the driving device 6 drives the screw 621 to rotate in the reverse direction, the nut 622 is driven to move forward away from the power component 61, and the above The connecting seat 623 will synchronously move the second moving member 51 of the lifting mechanism 5 forward, and then the first moving member 50 of the lifting mechanism 5 will be pushed by the second moving member 51 and the direction of the guiding mechanism 53. Restricting, synchronously engaging the guide 532 to slide obliquely upward along the tilting direction 52, thereby driving the printing platform 4 to perform a rising motion for performing CCD detection and printing operations.

Referring to FIG. 6 and FIG. 9 , when the power element 61 (servo motor) of the driving device 6 drives the screw 621 to rotate in the forward direction, the nut 622 is driven to move backward to approach the power element 61. The connecting seat 623 will synchronously drive the second moving member 51 of the lifting mechanism 5 to move backward, and then the first moving member 50 of the lifting mechanism 5 will be restricted by the traction of the guiding mechanism 53 to synchronously cooperate with the guiding base 532. The tilting direction 52 is obliquely slid, thereby driving the printing platform 4 to perform a lowering operation, so as to prevent the workpiece 20 from being in contact with the printing platform 4 during the pulling operation, thereby causing the workpiece 20 to be scratched. .

Referring to FIG. 10 and FIG. 11, after the lifting device 3 of the present invention performs the ascending stroke of the printing platform 4, the detecting device 22 performs three-dimensional moving operations such as ascending, front-rear, left-right, and the like, so that the photosensitive coupling of the detecting device 22 is performed. The device 23 is located above the printing platform 4, thereby directly comparing the images of the printing position of the workpiece 20, and transmitting the obtained screen and workpiece 20 images to the control system, thereby effectively reducing manual adjustment time and accurately printing to poor The rate is lowered to increase the printing capacity of the screen printing machine 2.

The above embodiments are intended to be illustrative only, and are not intended to limit the scope of the present invention. It is included in the scope of the following patent application.

2‧‧‧ screen printing machine
20‧‧‧Workpiece
21‧‧‧Roller
22‧‧‧Detection device
23‧‧‧Photosensitive coupling device
24‧‧‧Fixed surface
3‧‧‧ lifting device
4‧‧‧Printing platform
40‧‧‧Workboard
41‧‧‧Connecting plate
42‧‧‧ siding
43‧‧‧ accommodating space
5‧‧‧ Lifting mechanism
50‧‧‧First moving parts
501‧‧‧ first side
502‧‧‧ second side
503‧‧‧First level
504‧‧‧ first slope
51‧‧‧Second moving parts
511‧‧‧ first side
512‧‧‧ second side
513‧‧‧ second level
514‧‧‧second slope
52‧‧‧ oblique direction
53‧‧‧Guiding agency
531‧‧‧rail
532‧‧ ‧ guide
533‧‧‧Guide
6‧‧‧ drive
60‧‧‧Base
61‧‧‧Power components
62‧‧‧Transmission mechanism
621‧‧‧ screw
622‧‧‧ nuts
623‧‧‧Connector
624‧‧‧Substrate
625‧‧‧ Mounting frame
63‧‧‧Slip mechanism
631‧‧‧Slide rails
632‧‧‧Slide
633‧‧ ‧ chute
7‧‧‧ traction mechanism
70‧‧‧ rods
71‧‧‧Sleeve

1 is a cross-sectional view of a lifting device of the present invention; FIG. 2 is a perspective view of a lifting device of the present invention applied to a screen printing machine; FIG. 3 is a schematic view of the lifting device of the present invention installed on a screen printing machine to form a printing table; Figure 5 is an exploded view of the lifting mechanism of the lifting device of the present invention; Figure 6 is an exploded view of the driving device of the lifting device of the present invention; Figure 7 is an exploded view of the traction mechanism of the lifting device of the present invention; FIG. 9 is a schematic cross-sectional view showing the use of the lifting device for the lifting device of the present invention; FIG. 10 is a schematic cross-sectional view showing the lifting device of the lifting device of the present invention; A schematic view of the top view used in conjunction with the detection device.

24‧‧‧Fixed surface

3‧‧‧ lifting device

4‧‧‧Printing platform

40‧‧‧Workboard

41‧‧‧Connecting plate

42‧‧‧ siding

43‧‧‧ accommodating space

5‧‧‧ Lifting mechanism

50‧‧‧First moving parts

501‧‧‧ first side

502‧‧‧ second side

503‧‧‧First level

504‧‧‧ first slope

51‧‧‧Second moving parts

511‧‧‧ first side

512‧‧‧ second side

513‧‧‧ second level

514‧‧‧second slope

52‧‧‧ oblique direction

53‧‧‧Guiding agency

531‧‧‧rail

532‧‧ ‧ guide

6‧‧‧ drive

60‧‧‧Base

61‧‧‧Power components

62‧‧‧Transmission mechanism

621‧‧‧ screw

622‧‧‧ nuts

623‧‧‧Connector

624‧‧‧Substrate

625‧‧‧ Mounting frame

63‧‧‧Slip mechanism

631‧‧‧Slide rails

632‧‧‧Slide

7‧‧‧ traction mechanism

70‧‧‧ rods

71‧‧‧Sleeve

Claims (9)

A lifting device for printing a screen of a screen printing machine comprises: a printing platform; a driving device located below the printing platform and mounted on a fixing surface of a screen printing machine; at least one lifting mechanism connected to the printing platform And a first moving member and a second moving member opposite to the first moving member, wherein the first moving member is connected to the printing platform, and the second moving member and the driving device are And a traction mechanism having one end connected to the printing platform and the other end connected to the fixing surface for limiting the longitudinal displacement of the printing platform for ascending or descending; wherein the driving device drives the second movement of the lifting mechanism The displacement of the piece, the first moving member of the lifting mechanism will produce a one-position movement along an oblique direction, and simultaneously drive the printing platform to change the longitudinal height position. The lifting device for printing a screen of a screen printing machine according to the first aspect of the invention, wherein the first moving member side forms a first horizontal plane connecting the printing platform, and the other side forms a first horizontal direction defining the oblique direction. a first inclined surface; and a second horizontal surface connecting the driving device and a second inclined surface opposite to the first inclined surface. The lifting device for printing a screen of a screen printing machine according to the second aspect of the invention, wherein the first inclined surface of the first moving member and the second inclined surface of the second moving member are further provided with a group of forming guiding mechanisms The guide rail and the guide seat, the length direction of the guide rail extends parallel to the oblique direction, and the guide seat is movably assembled to the guide rail, and is restricted to reciprocally displace in the oblique direction by the action of the guide rail. The lifting device for printing a printing table of a screen printing machine according to the first aspect of the invention, wherein the traction mechanism is provided with a rod member extending in a longitudinal direction, and a movable sleeve outside the rod member Next, a sleeve that can be displaced from each other, the rod and the sleeve are respectively fixed to the bottom of the printing platform and the top of the fixing surface. The lifting device for printing a screen of a screen printing machine according to the first aspect of the invention, wherein the driving device is provided with a power component mounted on the fixing surface, and the power component is connected to a transmission mechanism for laterally moving, The transmission mechanism is further connected to the second moving member, so that the power element can drive the second moving member to move synchronously. The lifting device for printing a screen of a screen printing machine according to the fifth aspect of the invention, wherein the transmission mechanism is provided with a screw connected to the power component, and the screw is screwed to a screw that can reciprocate in a direction in which the screw extends. The cap is further connected to the connector by the nut, so that the connector can be displaced by the power component. The lifting device for printing a screen of a screen printing machine according to the fifth aspect of the invention, wherein the driving device further comprises at least one sliding mechanism, wherein the sliding mechanism is mounted between the transmission mechanism and the fixing surface for reducing The force exerting the displacement of the above transmission mechanism. The lifting device for printing a screen of a screen printing machine according to the seventh aspect of the invention, wherein the sliding mechanism comprises a slide rail attached to the fixing surface and at least one slide connected to the transmission mechanism. The lifting device for printing a screen of a screen printing machine according to the fifth aspect of the invention, wherein the power element is a servo motor.